« Last post by 90mustang5.0LX on January 20, 2015, 12:20:29 AM »
Ok so I have a 1990 5.0 mustang LX.... So this all started one day, I changed batteries because the original one wouldn't hold a charge. I started the car before I took out the original battery started right up no problem. When I put in the new battery and tried starting the car it turned over fine but just wouldn't start so after awhile after looking to make sure everything was connected right I noticed that my fuel pump relay was clicking nonstop. This would stop when I unplugged the fuel pump relay. So thinking that was the problem I replaced the relay. No change. So over a period of time and doing a little research I started replacing things thought to be the problem. Items replaced- fuel pump relay, tfi mod, pickup coil, distributor, cap, coil, fuel filter, Eec power relay, inertia switch, oil sending unit. No luck. But now my fuel pump stays on without the key even being on. Only thing I can think of is a bad computer or a faulty wire somewhere? I don't know what else to do. How can I check for a bad computer? Or does anyone have any other ideas of what could be going on? Any help would be much appreciated.